<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8'/>
    <title></title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no'/>
    <script src='../assets/mapbox-gl-dev.js'></script>
    <link href='../assets/mapbox-gl.css' rel='stylesheet'/>
    <style>
        body {
            margin: 0;
            padding: 0;
        }

        #map {
            position: absolute;
            top: 0;
            bottom: 0;
            width: 100%;
        }
    </style>
</head>
<body>

<div id="map"></div>
<script>
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    var map = new mapboxgl.Map({
        container: "map",
        style: "mapbox://styles/mapbox/outdoors-v9",
        center: [-121.403732, 40.492392],
        zoom: 10
    });

    map.on("load", function () {
        map.addSource("national-park", {
            "type": "geojson",
            "data": {
                "type": "FeatureCollection",
                "features": [{
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                }]
            }
        });

        map.addLayer({
            "id": "park-boundary",
            "type": "fill",
            "source": "national-park",
            "paint": {
                "fill-color": "#888888",
                "fill-opacity": 0.4
            },
            "filter": ["==", "$type", "Polygon"]
        });

        map.addLayer({
            "id": "park-volcanoes",
            "type": "circle",
            "source": "national-park",
            "paint": {
                "circle-radius": 6,
                "circle-color": "#B42222"
            },
            "filter": ["==", "$type", "Point"],
        });
    });
</script>

</body>
</html>